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Isospin violating decays of vector charmonia
- Source :
- European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-7 (2023)
- Publication Year :
- 2023
- Publisher :
- SpringerOpen, 2023.
-
Abstract
- Abstract We study the isospin violating decays of vector charmonia to $$\Lambda \overline{\Sigma }^0$$ Λ Σ ¯ 0 and its charge conjugate. They are dominated by the single photon annihilation and can be evaluated reliably with timelike form factors. We utilize the quark-pair creation model, which is valid for the OZI suppressed decays, to evaluate the form factors. We obtain the branching fractions of $$\mathcal{B}(J/\psi \rightarrow \Lambda \overline{\Sigma }^0+c.c.)=(2.4\pm 0.4)\times 10^{-5}$$ B ( J / ψ → Λ Σ ¯ 0 + c . c . ) = ( 2.4 ± 0.4 ) × 10 - 5 and $$\mathcal{B}(\psi (2\,S)\rightarrow \Lambda \overline{\Sigma }^0+c.c.)=(3.0\pm 0.5)\times 10^{-6}$$ B ( ψ ( 2 S ) → Λ Σ ¯ 0 + c . c . ) = ( 3.0 ± 0.5 ) × 10 - 6 , which are compatible with the measurements by the BESIII collaborations, respectively. The decay asymmetries are found to be $$\alpha _{J/\psi }=0.314$$ α J / ψ = 0.314 and $$\alpha _{\psi (2S)}=0.461$$ α ψ ( 2 S ) = 0.461 , which can be examined at BESIII in the foreseeable future.
Details
- Language :
- English
- ISSN :
- 14346052
- Volume :
- 83
- Issue :
- 10
- Database :
- Directory of Open Access Journals
- Journal :
- European Physical Journal C: Particles and Fields
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7e63eca89a17473b9ac45bd56953943d
- Document Type :
- article
- Full Text :
- https://doi.org/10.1140/epjc/s10052-023-12099-1